Patch Upstream: usb: chipidea: udc: fix memory leak in _ep_nuke

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commit: 7ca2cd291fd84ae499390f227a255ccba2780a81
From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Date: Thu, 4 Apr 2013 13:13:47 +0300
Subject: usb: chipidea: udc: fix memory leak in _ep_nuke

In hardware_enqueue code adds one extra td with dma_pool_alloc if
mReq->req.zero is true. When _ep_nuke will be called for that endpoint,
dma_pool_free will not be called to free that memory again. That patch
fixes this.

Cc: stable <stable@xxxxxxxxxxxxxxx> # v3.5
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/chipidea/udc.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index b4cac44..3d90e61 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -540,6 +540,12 @@ __acquires(mEp->lock)
 		struct ci13xxx_req *mReq = \
 			list_entry(mEp->qh.queue.next,
 				   struct ci13xxx_req, queue);
+
+		if (mReq->zptr) {
+			dma_pool_free(mEp->td_pool, mReq->zptr, mReq->zdma);
+			mReq->zptr = NULL;
+		}
+
 		list_del_init(&mReq->queue);
 		mReq->req.status = -ESHUTDOWN;
 
-- 
1.7.10.4
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